Two-dimensional metal organic skeleton composite membrane material, and preparation method and application

Abstract

The invention discloses a two-dimensional metal organic skeleton composite membrane material, and a preparation method and application, and belongs to the technical field of water treatment. In orderto solve the problems such as deep purification of various heavy metal ions in industrial tail water with interference of alkaline-containing metal ions and insufficiency of mechanical strength existing in an existing absorption material, the two-dimensional organic skeleton material with special selectivity for heavy metal ions in complex industrial tail water is firstly synthesized, polyvinylidene fluoride is taken as a membrane carrier, a two-dimensional metal organic skeleton coordination polymer is taken as a loading object, and the polyvinylidene fluoride and the two-dimensional metal organic skeleton coordination polymer are fixed through polyethyleneimine / diallyl dimethyl ammonium chloride; and moreover, the invention provides the preparation method of the novel composite membranematerial with environmental function, which is the two-dimensional metal organic skeleton composite membrane, and the composite membrane material can realize one-step separation of heavy metal ion pollutants such as Ni<2+>, Pb<2+>, Cu<2+>, Cd<2+> and Zn<2+> in tail water efficiently.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and more specifically relates to a two-dimensional metal-organic framework composite membrane material, a preparation method and an application. Background technique [0002] Today, with the rapid development of industry, the improvement of economic level and quality of life, the problem of heavy metal pollution in water is becoming more and more serious. These heavy metal elements (nickel, copper, zinc, chromium, cadmium, lead, etc.) discharged into the environment enter the human body along the food chain and accumulate in the body, causing serious damage to the lungs, kidneys, digestive system, respiratory system and skin of the human body. Damage can range from disease-causing to teratogenic, cancer-causing or fatal in severe cases. Generally speaking, heavy metal ions in environmental water mainly come from the tail water discharge of industrial manufacturing and power generation in...

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Problems solved by technology

However, the water flux and mechanical strength of the MOFs composite membrane material obtained by this method are not ideal; the prior art of the Chinese Patent Publication No. CN108586760A, which was published on September 2, 2018, introduces a new type of MOFs / polymerization The method of preparing composite membranes solves the problems of low mechanical strength and low membrane efficiency of MOFs composite membranes in the traditional composite process, but there are still phenomena such as limited water flux and uneven membrane matrix.

[0005] The publication number of this research group is CN 108211825A, a metal-organic framework composite membrane material and its preparation and application. Aiming at the problem that the existing adsorbents and treatment methods are not effective in treating trace heavy metal ions in high-salt wastewater, the selected class The zeolite metal-organic framework coordination polymer is used as a functional load, and the polymer polyvinylidene fluoride is used to make the membrane substrate, and the stable combination of two types of organic substances is realized, which effectively solves the problem of membrane hydrophilicity caused by the general blending method. Poor performance, the agglomeration behavior of polymer particles makes it poorly dispersed in the casting solution, easy to block the membrane pores, which reduces the water flux of the metal-organic framework composite membrane, and the mechanical strength is not high, so the load and the membrane substrate are more stable. The uniform combination ensures the water flux of the membrane material, improves the efficiency of wastewater treatment, and prolongs the service life of the membrane. When the salt concentration is much higher than the target heavy metal ion, it can still achieve various trace heavy metal ions in the water body. Advanced Processing and Security Control

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